Generate random but fancy numbers [closed]

I have been searching a lot to find any related topics, but can't find any.

I am looking for a fancy number generator that gives something like below:

• 1111
• 1221
• 9876
• 369
• 1234
• 789
• 1001

I know I am requesting for resources which would be a potential reason to close this question, but I am really looking for a start at least. Any help would be appreciated. It can be any programming language or packages or machine learning models or anything.

Or any functions which takes the list of numbers and gives fancy numbers back. Something like increasing/decreasing/repeating digits.